SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY
ISSUED: Monday, May 11, 2009 2:35 PM Jim Little
1. DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638
A fairly deep upper low for this time of year will move west to east across Washington on Tuesday. The associated cool upper trough sweeps across Oregon during the day. This will produce showers. Low level flow will be westerly. The cool air aloft will keep mixing heights high for good to excellent smoke dispersal conditions.
OUTLOOK (WEDNESDAY-FRIDAY):
The area will see weak ridging early then a weak upper trough will move through overnight Wednesday. While the upper trough is weak at there will be plenty of moisture available for a good wetting rain. Rain will spread into the region Wednesday night. Transport winds will be south-southeast to south-southwest. Mixing heights will remain favorable for good smoke dispersal. The trough pushes east on Thursday and higher pressure begins to build. Showers will end. By Friday ridging aloft will give dry weather to the region. Mixing heights will deteriorate somewhat Friday but still high enough for good smoke dispersal conditions.
2. DISPERSION
TUESDAY
Zone 630 and 632:
Mixing height above 5000 ft throughout the day.
Transport wind W to WNW at 20 - 36 mph during the morning and afternoon. Transport wind decreases to W to NW at 15 - 29 mph during the evening.
Surface wind WNW to NW at 15 - 25 mph during the morning and afternoon. Surface wind decreases to NW to NNW at 8 - 14 mph during the evening.
Zone 633 - 638:
Mixing height above 5000 ft throughout the day. Mixing height lowers to 2400 - 3400 ft during the evening.
Transport wind W to WNW at 18 - 32 mph during the morning and afternoon. Transport wind decreases to WNW to NW at 15 - 29 mph during the evening.
Surface wind NW to NNW at 15 - 25 mph during the morning and afternoon. Surface wind decreases to NW to N at 10 - 18 mph during the evening.
OUTLOOK:
WEDNESDAY
Mixing height below 1000 ft early rising to 4200 to 5000 ft by late morning rising above 5000 ft during the afternoon. Transport wind SSE to SSW at 9 - 15 mph during the morning becoming S to SW at 15 - 29 mph during the afternoon. Surface wind light and variable during the morning becoming SSW to WSW at 6 - 10 mph during the afternoon.
THURSDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon. Transport wind WSW to WNW at 9 - 15 mph. Surface wind WSW to WNW at 9 - 15 mph during the morning becoming WNW to NW at 10 - 16 mph during the afternoon.
FRIDAY
Mixing height 3500 to 4500 ft during the morning rising above 5000 ft during the afternoon. Transport wind light and variable. Surface wind light and variable during the morning becoming N to NE at 4 - 8 mph during the afternoon.
3. BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638
The following considerations should be adhered to in addition to
the requirements of the Oregon Smoke Management Plan. These
Instructions are valid for burning conducted on Tuesday, May 12, 2009.
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Zone 630 and 632:
Avoid ignitions within 10 miles to the W through NW of SSRAs. For units that will smolder significantly through the night avoid burning within at least 15 miles to the SE through NW in or near drainages leading to SSRAs. Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.
Zone 633 - 638:
Avoid ignitions within 10 miles to the W through NW of SSRAs. For units that will smolder significantly through the night avoid burning within at least 15 miles to the SW through NW in or near drainages leading to SSRAs. Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.
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4. SPECIAL NOTE:
The smoke management forecaster is available at (503)-
945-7401. Please call this number and not individual's
numbers to discuss daily burning. For large burns (over
2000 tons) or burns extending over a considerable period,
please request a special forecast. Avoid calling before
8 a.m. and between 2 to 3 p.m.
This forecast is available on the Internet at:
http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management
Please ensure your units have been planned and accomplished by checking:
http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml
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